Wide scanning x-ray source

• US 7,197,116 B2
• Filed: 11/16/2004
• Issued: 03/27/2007
• Est. Priority Date: 11/16/2004
• Status: Active Grant

• Current Assignee: GE Medical Systems Global Technology Company LLC (GE Healthcare Technologies, Inc.)
• Original Assignee: General Electric Company
• Inventors: Price, John Scott, Dunham, Bruce M.
• Primary Examiner(s): Glick; Edward J.
• Assistant Examiner(s): SONG, HOON K
• Application Number:
  US10/904,560
• Publication Number:
  US 20060104418A1
• Time in Patent Office: 861 Days
• Field of Search: 378/9, 378124-125, 378143-144, 378/119, 378/137, 378/126, 378/134, 378/138
• US Class Current: 378/124
• CPC Class Codes: H01J 2235/086 Target geometry
• CPC Class Codes: H01J 35/10 Rotary anodes; Arrangements for rotating anodes; Cooling rotary anodes
• CPC Class Codes: H01J 35/153 Spot position control
• CPC Class Codes: H01J 35/30 by deflection of the cathode ray

Abstract

An imaging tube (12) includes a cathode (30) that emits an electron beam (32) and an anode (38). The anode (38) includes multiple target surfaces (36). Each of the target surfaces (36) has a focal spot that receives the electron beam (32). The target surfaces (36) generate multiple x-ray beams (42) in response to the electron beam (32). Each x-ray beam (42) is associated with one of the target surfaces (36). An x-ray imaging system (10) includes the cathode (30) and the anode (38). A controller (28) is electrically coupled to the cathode (30) and adjusts emission of the electron beam (32) on the anode (38).

Claims

1. An imaging tube comprising:

a cathode emitting at least one electron beam; and

an anode comprising a plurality of target surfaces having a plurality of focal spots, said plurality of target surfaces on a plurality of individually mounted tracks that are mechanically coupled to an exterior side of said anode;

wherein

said plurality of focal spots receiving said at least one electron beam and reflectively generating a plurality of x-ray beams off of said target surfaces and directed away from said anode, each of said x-ray beams associated with one of said plurality of target surfaces.

2. An imaging tube as in claim 1 wherein said plurality of tracks have different heights.

3. An imaging tube as in claim 1 wherein said plurality of tracks are stacked rings.

4. An imaging tube as in claim 1 wherein said plurality of tracks are integrally formed as part of said anode.

5. An imaging tube as in claim 1 wherein said plurality of focal spots reflectively generate said plurality of x-ray beams off of said plurality of tracks.

6. An imaging tube comprising:

a cathode emitting at least one electron beam; and

an anode comprising a plurality of target surfaces having a plurality of focal spots, said plurality of target surfaces on a plurality of individually mounted tracks that are mechanically coupled to an exterior side of said anode;

said plurality of focal spots receiving said at least one electron beam and reflectively generating a plurality of x-ray beams, each of said x-ray beams associated with one of said plurality of target surfaces;

wherein said anode comprises;

a plurality of body rings; and

a plurality of target rings stacked with said body rings.

7. An x-ray imaging system comprising:

a cathode emitting at least one electron beam;

an anode comprising a plurality of target surfaces having a plurality of focal spots, said plurality of target surfaces on a plurality of tracks that are mechanically coupled to said anode and have different heights;

said plurality of focal spots receiving said at least one electron beam and generating and directing a plurality of x-ray beams away from said anode, each of said x-ray beams associated with at least one of said plurality of target surfaces; and

a controller electrically coupled to said cathode and adjusting emission of said at least one electron beam on said anode.

8. A system as in claim 7 wherein said anode is in the form of a cylinder.

9. A system as in claim 7 wherein said cathode is a sealed electron source.

10. A system as in claim 7 wherein said cathode is an electron gun.

11. A system as in claim 7 wherein said controller adjusts at least one of focusing, voltage potential, steering angle, rastering angle, electron energy acceleration level, and current of said cathode.

12. A system as in claim 7 further comprising a cathode steering mechanism mechanically coupled to said cathode and electrically coupled to said controller and said controller steering said at least one electron beam over a range of angles.

13. A system as in claim 7 wherein said controller rasters said cathode over said plurality of target surfaces.

14. A system as in claim 7 wherein said plurality of tracks are stacked rings.

15. A system as in claim 7 wherein said plurality of tracks are integrally formed as part of said anode.

16. A system as in claim 7 wherein said plurality of target surfaces are a predetermined distance from said cathode.

17. A system as in claim 7 wherein said anode comprises a plurality of rings each ring corresponding to a target surface of said plurality of target surfaces.

18. A system as in claim 17 wherein said plurality of rings are formed by layers of material applied to said anode.

19. A system as in claim 7 further comprising a collector passively collecting electrons of a scattered beam generated upon incidence of said at least one electron beam on said plurality of target surfaces.

20. A system as in claim 7 wherein said cathode is a member of a replaceable subassembly.

21. A system as in claim 7 wherein said cathode comprises a variable potential applied focusing electrode.

22. A system as in claim 7 wherein said plurality of x-ray beams have a combined x-ray beam width of greater than 10 mm.

23. A system as in claim 7 wherein incident angles of said at least one electron beam upon said plurality of target surfaces are approximately between 20°

and 90°

relative to a center axis of said anode.

24. A system as in claim 7 further comprising an x-ray window having a length associated with a width of said plurality of x-ray beams.

25. A method of scanning an object within an x-ray imaging system comprising:

rotating an anode having a plurality of non-adjacent and separate target surfaces;

emitting a single electron beam incident upon said plurality of non-adjacent and separate target surfaces; and

generating a plurality of x-ray beams in response to simultaneous impact of said electron beam on said plurality of non-adjacent and separate target surfaces.

26. A method as in claim 25 wherein said electron beam is emitted with an emission angle of less than or equal to approximately 30°

relative to said anode and simultaneously impinges upon said plurality of non-adjacent and separate target surfaces.

27. A method as in claim 25 further comprising performing a task selected from at least one of adjusting emission of said at least one electron beam, gating voltage potential of a cathode, adjusting focusing of a cathode, adjusting voltage potential of an x-ray tube component, adjusting current of said cathode, uniformly generating a focal spot on each of said non-adjacent and separate target surfaces, and steering said at least one electron beam.

28. A method of scanning an object within an x-ray imaging system comprising:

rotating an anode having a plurality of discontinuous nonadjacent target surfaces;

emitting a single electron beam incident upon said plurality of discontinuous nonadjacent target surfaces;

generating a plurality of x-ray beams in response to simultaneous impact of said electron beam on said plurality of discontinuous nonadjacent target surfaces; and

emitting a plurality of simultaneously impinging electron beams, which are emitted and simultaneously impinge upon said plurality of discontinuous nonadjacent target surfaces.

29. An imaging tube comprising:

a single electron beam source emitting at least one electron beam; and

an anode comprising a plurality of stand-alone non-opposing target surfaces having a plurality of focal spots;

said plurality of focal spots receiving said at least one electron beam simultaneously and generating a plurality of x-ray beams, each of said x-ray beams associated with one of said plurality of stand-alone non-opposing target surfaces.

30. An imaging tube comprising:

a cathode emitting at least one electron beam; and

an anode comprising a plurality of discontinuous nonadjacent target surfaces having a plurality of focal spots, said anode comprising and formed of a plurality of body structural rings coupled to each other, each of at least two of said body structural rings having at least one of said plurality of discontinuous nonadjacent target surfaces;

said plurality of focal spots receiving said at least one electron beam and generating a plurality of x-ray beams, each of said x-ray beams associated with one of said plurality of discontinuous nonadjacent target surfaces.